I recently solved a problem on my OS X 10.5.7 installation where the coreaudio driver was in a constant “not responding” state and slowing down Final Cut Pro.
Aside from rebooting, a permanent solution involved removal of the CoreAudio plug-in from the system (details here). Since I’m not using the Digidesign equipment which uses this particular CoreAudio plug-in, my work wasn’t impacted.
Should you need to completely reinstall the driver for any reason you can grab them for OS X 10.5 and OS X 10.4.
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